Python: Iterate a given list cyclically on specific index position

Last update on April 19 2025 13:01:28 (UTC/GMT +8 hours)

Iterate List Cyclically at Index

Write a Python program to iterate a given list cyclically at a specific index position.

Visual Presentation:

Sample Solution:

Python Code:

# Define a function called 'cyclically_iteration' that iterates a list cyclically based on a specific index position.
def cyclically_iteration(lst, spec_index):
    result = []  # Initialize an empty list to store the cyclically iterated elements.
    length = len(lst)  # Get the length of the input list.
    
    # Iterate through the list, starting from the 'spec_index' and wrapping around to the beginning if necessary.
    for i in range(length):
        element_index = spec_index % length  # Calculate the index of the current element based on 'spec_index'.
        result.append(lst[element_index])  # Append the element at the calculated index to the result list.
        spec_index += 1  # Increment 'spec_index' for the next iteration, to move to the next element.
    
    return result  # Return the list of cyclically iterated elements.

# Create a list of characters 'chars'.
chars = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']

# Print a message indicating the original list of characters.
print("Original list:")
print(chars)

# Specify a specific index position 'spec_index' for cyclic iteration and print a message.
spec_index = 3
print("\nIterate the said list cyclically on specific index position", spec_index, ":")
# Call the 'cyclically_iteration' function with 'chars' and 'spec_index' and print the result.
print(cyclically_iteration(chars, spec_index))

# Specify a different specific index position 'spec_index' for cyclic iteration and print a message.
spec_index = 5
print("\nIterate the said list cyclically on specific index position", spec_index, ":")
# Call the 'cyclically_iteration' function with 'chars' and the new 'spec_index' and print the result.
print(cyclically_iteration(chars, spec_index)) 

Sample Output:

Original list:
['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']

Iterate the said  list cyclically on specific index position 3 :
['d', 'e', 'f', 'g', 'h', 'a', 'b', 'c']

Iterate the said  list cyclically on specific index position 5 :
['f', 'g', 'h', 'a', 'b', 'c', 'd', 'e']

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to cyclically iterate over a list starting from a specified index and return the reordered list.
• Write a Python program to cyclically rotate a list from a given index and then reverse only the rotated portion.
• Write a Python program to iterate a list cyclically at a specified index and interlace the result with the original order.
• Write a Python program to simulate a cyclic shift of list elements by k positions starting from a specific index.

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